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          js中的call函数
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        <h4 id="方法重用"><a href="#方法重用" class="headerlink" title="方法重用"></a>方法重用</h4><p>使用<code>call()</code>方法，你可以编写能够在不同对象上使用的方法。</p>
<h4 id="函数是对象方法"><a href="#函数是对象方法" class="headerlink" title="函数是对象方法"></a>函数是对象方法</h4><p>在javascript中，函数是对象的方法。</p>
<p>如果一个函数不是JavaScript对象的方法，那么它就是全局对象的方法。</p>
<h4 id="JavaScript-call方法使用实例"><a href="#JavaScript-call方法使用实例" class="headerlink" title="JavaScript call方法使用实例"></a>JavaScript call方法使用实例</h4><p><code>call()</code>方法是预定义的JavaScript方法</p>
<p><strong>它可以用来调用所有者对象作为参数的方法</strong></p>
<p>通过<code>call()</code>方法，你可以使用属于另一个对象的方法。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> person = &#123;</span><br><span class="line">    <span class="attr">fullName</span>: <span class="keyword">function</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="variable language_">this</span>.<span class="property">firstName</span> + <span class="string">&quot; &quot;</span> + <span class="variable language_">this</span>.<span class="property">lastName</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">var</span> person1 = &#123;</span><br><span class="line">    <span class="attr">firstName</span>:<span class="string">&quot;Bill&quot;</span>,</span><br><span class="line">    <span class="attr">lastName</span>: <span class="string">&quot;Gates&quot;</span>,</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">var</span> person2 = &#123;</span><br><span class="line">    <span class="attr">firstName</span>:<span class="string">&quot;Steve&quot;</span>,</span><br><span class="line">    <span class="attr">lastName</span>: <span class="string">&quot;Jobs&quot;</span>,</span><br><span class="line">&#125;</span><br><span class="line">person.<span class="property">fullName</span>.<span class="title function_">call</span>(person1);  <span class="comment">// 将返回 &quot;Bill Gates&quot;</span></span><br></pre></td></tr></table></figure>
<h4 id="带参数的call"><a href="#带参数的call" class="headerlink" title="带参数的call()"></a>带参数的call()</h4><p>call()方法可以接受参数</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> person = &#123;</span><br><span class="line">  <span class="attr">fullName</span>: <span class="keyword">function</span>(<span class="params">city, country</span>) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="variable language_">this</span>.<span class="property">firstName</span> + <span class="string">&quot; &quot;</span> + <span class="variable language_">this</span>.<span class="property">lastName</span> + <span class="string">&quot;,&quot;</span> + city + <span class="string">&quot;,&quot;</span> + country;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">var</span> person1 = &#123;</span><br><span class="line">  <span class="attr">firstName</span>:<span class="string">&quot;Bill&quot;</span>,</span><br><span class="line">  <span class="attr">lastName</span>: <span class="string">&quot;Gates&quot;</span></span><br><span class="line">&#125;</span><br><span class="line">person.<span class="property">fullName</span>.<span class="title function_">call</span>(person1, <span class="string">&quot;Seattle&quot;</span>, <span class="string">&quot;USA&quot;</span>);</span><br></pre></td></tr></table></figure>
<h4 id="call函数和apply函数比较"><a href="#call函数和apply函数比较" class="headerlink" title="call函数和apply函数比较"></a>call函数和apply函数比较</h4><p>用法很相似，都能够编写用于不同对象的方法</p>
<h5 id="区别"><a href="#区别" class="headerlink" title="区别"></a>区别</h5><ul>
<li><p><code>call()</code>方法分别接受参数</p>
</li>
<li><p><code>apply()</code>方法接受数组形式的参数</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> person = &#123;</span><br><span class="line">  <span class="attr">fullName</span>: <span class="keyword">function</span>(<span class="params">city, country</span>) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="variable language_">this</span>.<span class="property">firstName</span> + <span class="string">&quot; &quot;</span> + <span class="variable language_">this</span>.<span class="property">lastName</span> + <span class="string">&quot;,&quot;</span> + city + <span class="string">&quot;,&quot;</span> + country;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">var</span> person1 = &#123;</span><br><span class="line">  <span class="attr">firstName</span>:<span class="string">&quot;John&quot;</span>,</span><br><span class="line">  <span class="attr">lastName</span>: <span class="string">&quot;Doe&quot;</span></span><br><span class="line">&#125;</span><br><span class="line">person.<span class="property">fullName</span>.<span class="title function_">apply</span>(person1, [<span class="string">&quot;Oslo&quot;</span>, <span class="string">&quot;Norway&quot;</span>]);</span><br></pre></td></tr></table></figure>
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